National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Monitor Stage: N/A Flood Stage: 7.5 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2023
4,980
8.42
May 23, 2023
2022
2,430
6.25
Oct 25, 2021
2021
1,410
5.02
May 7, 2021
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Mostly sunny early in the morning, then chance of showers and slight chance of thunderstorms in the late morning and early afternoon. Partly sunny with chance of thunderstorms late in the afternoon. Highs 88 to 100. Southeast winds up to 5 mph shifting to the southwest in the afternoon. Chance of precipitation 50 percent.

Tonight: Mostly cloudy with chance of thunderstorms in the evening, then partly cloudy with slight chance of thunderstorms after midnight. Lows 68 to 76. North winds up to 10 mph shifting to the northeast after midnight. Chance of thunderstorms 40 percent.

Wednesday: Partly sunny. Chance of thunderstorms. Highs 86 to 98. Southeast winds up to 5 mph shifting to the southwest in the afternoon. Chance of thunderstorms 50 percent.

Wednesday Night: Mostly clear. Lows 64 to 74. West winds 5 to 10 mph shifting to the east after midnight.

Thursday: Sunny. Highs 83 to 95. Southeast winds up to 5 mph shifting to the southwest 5 to 15 mph in the afternoon.

Thursday Night: Mostly clear. Lows 61 to 71.

Friday through Saturday: Clear. Highs 76 to 91. Lows 55 to 65.

Saturday Night: Mostly clear. Lows 54 to 64.

Sunday: Sunny. Highs 77 to 89.

Sunday Night: Mostly clear. Lows 55 to 63.

Monday: Sunny. Highs 79 to 91.
Impacts - E19 Information
13.27 FeetFlood of Record: 1/2/97. $178 million in damage to Yosemite Valley.
10.0 FeetNorthside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles.
8.2 FeetSwinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover.
7.5 FeetFlood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood.
7.0 FeetNorth Pines and Lower Pines campgrounds begin flooding.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.